What makes it turned rust colored?

 

Being used... When coolant gets real old it'll get a reddish discoloration. If it's old coolant, its normal. May I recomend a coolant flush?

 

If your coolant is that color i would definately say flush it. Coolant actually carries a voltage, if that voltage becomes too heavy it can cause the coolant to become acidic and begin eating away your valvetrain.

If you want to test your coolant voltage take a voltameter and just dip it in the radiator, then look up maximum tolerance in your owners manual or online.

 

My guess would be Rust!! You're filling a cast iron engine block with a water based liquid, you're going to get some corrosion. Like the others said flush the system, and fill it with new coolant. Make sure you use 50:50 coolant and distilled water, cheaping out and using less coolant just speeds up the corrosion. And change it every 2 years, or even sooner.

 

What he said... Although I wouldn't go as far to say you HAVE to use distilled water....but, it helps.

 

Yes "rust" is the problem , probably like the previous posts state - not enough anti-freeze in your mix.
Anti-freeze will get dingy and dirty with age , flush and fills are required maintenence on all vehicles to keep corrosion under control .

 

I am not as knowledgeable as the others here, but I've never seen it turn from green to red in any of my other vehicles due to age. I do remember that there was an "environment friendly" version that came out several years ago that looked red. I can't remember, but I think it was when they first started trying to make it where it wouldn't kill animals if they drank it.

May be that this is what it is. Anytime I've ever seen rust in my antifreeze, it just looked like flakes of rust in green antifreeze.

Just my 2 pennies.

 

Toyota brand coolant is red, not green. Maybe it's just dirty red and not really rusty.

 

Yeah , I second that possibility

 

i bought the truck a few months ago and didnt check it when i bought it (witch i should have) and it is heating up more than normal so i will flush it and change it.

 

Throw a T-Stat in it while you are at it if its running warmer than usual and beware aftermarket recommended temp of 195 degree , OEM is 180 Degree !
I went to Prep Boys and their book said a 195 degree so I got a 180 so it would run cooler , found out that OEM Yota Stat is 180 degree so all I did was put the right one in , go figure .

 

My coolant is also rust-colored and it has smal pieces in it. I do think that it is remains from a sealer that i used to seal "something" that was leaking coolant. Could never figure it out what is was...But its holding up. Should i change the coolant or will it effect the seal?

By the way, is it hard to change the T-Stat...?

 

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If I had stuff floating in my coolant I would change it just for General Purpose so it wasn't in there wandering around , flushing and re-filling would not hurt a seal at all unless your talking about that Radiator Stop Leak mess , in that case a aggressive shop stye compressed air flush may affect that a little bit .
I I have a '91 3VZE motor and the T-Stat is just to the right of the water pump (follow top hose on radiator to motor and it should be there) , only 2 screws and a gasket (which local parts place didn't have -had to get from dealer) , you can use RTV if you wish but I would go with the OEM Gasket.
I think I mentioned in a previous thread to be careful about the temperature of the stat as the recommended stats at Prep Boys and such are inaccurate (they list a 195 degree when it should be 180 degree).
Outside of that it should be very easy to do and if I had chunks of gasket and or anything in my radiator I would definately flush and fill it .
Just remember previous post also , there are some coolants that are red in color and your may be that type and just dirty , but the chunks of stuff or particles of any type should not be in coolant system unless you have used that Radiator Stop Leak mess .

 

i dont have stuff floating in mine and it may be that red coolant but as soon as i get a free few hours im going to change it out and hope that it is just dirty

 

Thanks for the info!
And yes, i used Radiator Stop Leak mess...

 

well did a full coolant flush and oil change, also threw some seafoam in and now im running well except now my idle goes up and down when i brake i know this is a common problem with these so im just going to leave it i think